What to do in case of an accident with a person from another country?

The person driving, was traveling to work, when a tractor truck hit the car from behind. He ( the driver of the tractor truck), took pushed the car for a whiled before the car finally began to spin out, hitting the middle divider on the highway. The car that got hit is a 2002 Honda civic, both doors; the drivers and the back passengers were damaged to the point where you can't open the door, also broke one of the wheels on the right side of the driver. The car is a complete loss, while the tractor truck continued on his way. Police were called to the scene. An mentioned the driver driving the tractor truck was from Canada, with a Canadian insurance. While the accident occurred in Richmond, Virginia. (United States). Could anyone who has probable experience something familiar please give me some options of how I can proceed with this. Thank you.
Added (1). Excuse all the errors in my typing.

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